fixed lint

Author: daniel-sanche

google/auth/_default.py

@@ -18,12 +18,11 @@
 """
 from __future__ import annotations
 
-from typing import Sequence
 import io
 import json
 import logging
 import os
-from typing import Optional, TYPE_CHECKING
+from typing import Optional, Sequence, TYPE_CHECKING
 import warnings
 
 from google.auth import environment_vars